"Something is going on there. Either he's a closet lawyer or a closet paralegal or somebody's helping him."

Hutton said small type at the lower left corner of the second page of the two-page filings suggests that Rader is using the same sequential filing system law firms use. He said the system allows lawyers to cross-reference their filings.

"Either there's an attorney incarcerated over there or a hot-shot paralegal," Hutton said. "Somebody's giving him some legal advice."

Hutton said he's had some experience with "jailhouse lawyers" with no legal training.

"I've seen those, and they're not really always well done," he said. "This is very well done. Somebody with a lot of talent is helping him behind the scenes. Or he's been going to law school at night."

Sutton said Rader has 20 days from the filing of each lawsuit to answer the charges against him. Had Rader taken no action, Hutton said, a default judgment eventually would have been entered in the case and Rader would have been ordered to pay all claims against him.

Rader, 60, pleaded guilty last month to 10 counts of first-degree murder and will be sentenced in August.

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Kerri Rawson, the daughter of BTK serial killer Dennis Rader, released her memoir on Tuesday. Several documentaries, television interviews and magazine cover stories also are scheduled in the coming weeks.